Carburetor for internal-combustion engines



Aug. 5, 1930.

w. H. MANNERS Er AL. 1,772,259

CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed April 25. 1929 Patented Aug. 5, 1930 UNITED s rAss WILLIAM HASLAM MANNERS AND oEoIL WHES'TEEAD; si nncnn, on, xit'uennsnonr,

7 Union or SOUTH AFRICA I w CABBURETOR non m'rnaimncoianusrron ENGINES-1,

Application filed April 25,

This invention. relates to carburetors for internal-combustion engines, or the devices employed for comminuting and controlling the supply of petrol or other liquid fuel (here inafter referred to as petrol) to the cylinders of such engines.

The invention appertains more particularly to carburetors of the type in which the petrol is caused to pass through a slot or slit in the I petrol supply tube, and'in which means are provided for varying the effective length of the slot or slit to control the petrol supply.

The object of'the present invention is to render such carburetors more effective in operation, and thereby to utilize the petrol more economically, and so obtain a higher-etficiency in the engine.

In accordance with the invention means are provided whereby an auxiliary and reguiiv latable supply or quantity of air is introduced into the petrol supply tube and caused to pass, together with the petrol, through the slot or slit in said tube, in order the more efiic'iently to comminute or atomize the petrol in its passage tot-he cylinders of the engine.

The means whereby the auxiliary air supply is introduced into the petrol supply tube may consist of a passage formed through the means for controlling the effective length of 39 the slot or slit in the petrol supply tube, and

an arrangement whereby aregulated quantity of air is permitted to pass to and through said passage. v

The arrangementfor controlling the aux- 35 ili'ary supply of air to the petrol supply tube maybe operated by hand, or automatically as, for example, bymeans of av suitablegovernor driven by the engine; I The controlling means may include a hollow cylinder, formed with a slot which providesthe auxiliary air inlet to such cylinder, apiston or plunger arranged in'said cylinder and adapted to controlthe effective length of the slot, ymeanslfor moving said piston or plunger inwthe direction to open the slot, and a spring medium for moving the piston or plunger inthe other direction to close the slot. If the auxiliary air controlling means is'hand-actuated, then this may be elfected by meansof a wire suitably connected to the piston or plunger and 192a. "serial No. 358,057." 1

adapted to be operated by the driver of the vehlcle, by suitable means, at a: point onthe dashboard, or in any other convenient position readily accessible to him. I

arranged, relative to the otherco-operating parts of the ordinary carburetor construction, that the mixture-of comminutedpetrol and auxiliary air is mixed'with the main airsupply entering through the ordinary airinlet, and passes in the usual manner through the induction pipe to the cylinders of the engine.

The invention will be-rnore fully explained with the aid of the accompanyingsheetj of drawings, wherein it is shown applied to a carburetor of the type hereinbefore-re-ferredto. In the drawings, I a

Fig. 1 is a part-sectionalelevation of'the carburetor. p

Fig. 2 is a sectional plan of Fig. 1, the plane of section being'indicated by the dotted line m-w in Fig. 1. I a

Fig. 3 is an elevation of the carburetor, drawn toa reduced scale.

Fig. 4 is an elevation'of the slotted petrol supply tube.

Fig. 5 is an elevation of the mean's'for controlling theeffective length of-fthe' slot in the petrol supply tube, and providing-gthep-assage for the'auxiliary air into 'saicl tube yand Fig. 6 is a part-sectional plan view of the auxiliary air inlet cylinder and the means for controlling the admission of airthereintoy As shown in Figs. 1 to- 3, thebody or casing includes the two hollow cylindrical parts l, 2,

The petrol supply tube is so constructedand and theinterniediate rectangular portion- 3 connecting said parts 1, 2, and placing the interiors thereofin communication. Th'e cylindrical part lprovides the main airinlet' 4:, and the cylindrical part 2' the induction passage 5 for leading the explosive mixture to the engine; 6 being the valve in the part 1 for controlling the'main air supply, which passes into and through" the intermediate part 3; and

7 the valve-tor" controlling the passage of the explosive mixture along'the induction-passage 5 to the engine.

8 is the float teed-chamber, shown-constructed with an-arm or projection 9",'h'aving at its outer end a conical recess 10 which its fits a tapered boss or projection 11 formed on the intermediate part 3 of the body or casing; 12 being a screw plug which serves for retaining the arm 9 in position on the tapered boss or projection 11. The petrol passes from the float teed. chamber 8 into an annular space 13 which is provided by the bottom of the recess 10, below the inner end of the tapered boss or projection 11. In the plug 12' there is provided a passage 14 through which the petrol can pass from the annular space 13 to a space 15above the upper end of the plug 12.

16 is the petrol supply tube, which is housed within the intermediate portion 3 of the casing and is constructed at the inner end with a fiange or shoulder 17 which fits against the inner end of the screw-threaded hole 18 in the tapered boss or projection 11. The petrol supply tube 16 is retained in position .by the screw plug 19, which is tapered at its inner end and is screwed into the hole 18 into engagement with the flanged inner end of the tube 16. The space 15 is formed between the adjacent ends of the plugs 12 and 19, and the plug 19 is formed with a hole 20 through which the petrol passes from the space 15 into the lower end of the petrol supply tube 16.

The upper end of the petrol supply tube 16 istapered slightly at 21see also Fig. 4

1 to fit a correspondingly taperedhole formed in a boss 22 provided on the top of the intermediate part 3 of the casing. 23 is the slit or slot provided in the petrol supply tube 16, which forms the passage for the petrol from the tube 16 into the intermediate part 3. The passage is directed towards the part 2 of the casing, and may, as shown, be formed in a flat piece 24 fitted in an opening in the I tube 16.

25see also Fig. 5is the cylindrical member or valve which operates to regulate or control the quantity of petrol which is permitted to pass through the slot or slit 23, by varying the effective length of said slot or slit 23. For this purpose the inner end of the member or valve 25 is bevelled off, so that when it is rotated it either gradually closes or opens the slot or slit 23, according to the direction inwhich it is rotated. Thevalve25 is fashioned with a milled flange 26 which rests upon the boss 22, and is provided for rotating the valve 25 to set or adjust it. It is also constructed with a shoulder 27 formed by an annular enlargement. The outer end of the valve 25 is recessed, as indicated at 28, to receive one end of the auxiliary air supply tube 29. A hole 30 is formed from the inner end of the recess 28 through the valve 25 to the bevelled inner end thereof, so that air in regulatable quantity is permitted to pass into-the petrol supply tube 16, opposite the slot or slit 23.

.The auxiliary air which is drawn in and admitted in this way through the valve 25, issues along with the petrol through the slot or slit 23, and ensures the commi'nution of the petrol to a very high degree before it commingles with the main air supply which is drawn in through the main air inlet 4 in the part 1 of the body'or casing.

31 is the hollow cylinder of the controlling means for the auxiliary air supply. This cylinder-31 is closed at the one'end 32, and the auxiliary air supply tube 29 communicates with cylinder 31 at that end. The cylinder 31 is constructed with a spiral slot 33 which forms the inlet into, the'cylinder 31 for the auxiliary air, and the opening and closing of'which slot 33 cleterminesthe volume of air which can enter the cylinder 31 andpass I through tube-29 and valve 25 to the petrol supply tube 16." 34 is the piston or plunger which isarranged in thecylinder 31 and is adapted to be moved longitudinally thereof in one direction to open the slot 33, in order to control the efiective length of saidslot 33.. This movement is effected by a wire 35 attached to the end of the piston 34 and work ing through a casing'36 which-is fixed to the cylinder 31 by a screw-threaded bush 37. 38see Fig. 6-is the spring,which is placed in compression when the piston or plunger 34 is moved by the wire 35 in the opening direction, and operates to move the piston or plunger 34 in the opposite or closing direction when the wire is released.

The cylinder 31 'is shown attached, by

means of bracket 39, to the cylindrical part 2 of the body or casing; 40fbeing a screw for fixing the bracket 39 on a boss 41 formed on said part 2. v

The main air inlet valve 6, the valve 7 for controlling the supply of the explosive 1 mixture to the engine, and the valve 25 for controlling the supply of petrol which passes through the slot or slit 23 in the petrol sup ply tube 16, are all operated simultaneously from a single control placed in a convenient position, say on the. dashboard, readily ac connected together by an inverted T-shaped yoke or connecting member 45 see Fig. 3. The various levers 42, 43, 44, are each shown clamped at one end to its respective valve,

and at or near their other ends the levers are kept in engagement 'with'the ends ofthe yoke 45 by means of split pins '46. Y The le+ vers 42, 43 are each shown constructed with an extension 47 so that the single controlling means for all the valves can be attached to either of said levers, as may be found neces- IOU sary according to the arrangement and disposition of the carburetor.

In the operation of the carburetor the various valves are set or adjusted relative to each other so as to obtain the requisite proportion of atmospheric air to petrol, and admit the requisite volume of the explosive mixture of petrol and air to the cylinders of the engine. As the conditions vary and necessitate or render desirable the admission of or increase or decrease of the amount of auxiliary air to the petrol supply tube 16, to mix with the petrol as it issues through the slot or slit 23, the position of the piston 34 is altered accordingly to vary the effective length of the slot 33 in the auxiliary air admission cylinder 81.

In addition to the advantages above referred to, which accrue to the invention, it allows of a better mixture of the petrol and air being obtained at all times to suit the running conditions, and by affording control of the admission of the auxiliary air supply, obviates excessive heating of the engine.

What we claim as our invention and desire to protect by Letters Patent is A carburetor for internal combustion engines, including a petrol supply tube having a narrow slot through which the petrol passes, and a rotatable member for controlling the supply of petrol to said slot, said member having a bevelled end, which 00- operates with the narrow slot to control the effective length of the same, and having a longitudinal passage therethrough, which terminates in the bevelled end thereof for admitting an auxiliary air supply to the tube, so that said auxiliary air and the petrol pass together through the narrow slot in the tube before mixing with the main air supply, as set forth.

In testimony whereof we have signed our names to this specification.

WILLIAM HASLAM MANNERS. CECIL WHESTHEAD SPENCER. 

